From the main screen click on the envelope (bottom right), then the pen and paper (bottom left), then the right hand central icon (adress book). On the front of the address book is your 16 digit Wii console code

go to your wii message board in the lower right hand corner...then in the lower left hand corner youll see create message or something like that click on that and on the cover of your address book is your number and in that book is where you register friends